CN102027233B - Method of reducing torsional oscillations in the power train of a wind turbine - Google Patents

Method of reducing torsional oscillations in the power train of a wind turbine Download PDF

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Publication number
CN102027233B
CN102027233B CN2009801172746A CN200980117274A CN102027233B CN 102027233 B CN102027233 B CN 102027233B CN 2009801172746 A CN2009801172746 A CN 2009801172746A CN 200980117274 A CN200980117274 A CN 200980117274A CN 102027233 B CN102027233 B CN 102027233B
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CN
China
Prior art keywords
electrical network
torsional oscillation
power train
braking moment
instantaneous
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CN2009801172746A
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CN102027233A (en
Inventor
D·卡斯特利马丁内斯
C·卡萨诺瓦斯贝尔梅霍
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Alstom Wind SL
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Alstom Wind SL
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/0244—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor for braking
    • F03D7/0248—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor for braking by mechanical means acting on the power train
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D15/00—Transmission of mechanical power
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D15/00—Transmission of mechanical power
    • F03D15/10—Transmission of mechanical power using gearing not limited to rotary motion, e.g. with oscillating or reciprocating members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/20—Wind motors characterised by the driven apparatus
    • F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/90—Braking
    • F05B2260/902—Braking using frictional mechanical forces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/10—Purpose of the control system
    • F05B2270/101—Purpose of the control system to control rotational speed (n)
    • F05B2270/1011—Purpose of the control system to control rotational speed (n) to prevent overspeed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/10—Purpose of the control system
    • F05B2270/103—Purpose of the control system to affect the output of the engine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Abstract

The present invention refers to a method of reducing torsional oscillations in the power train of a wind turbine in the event of grid loss. According to the method, after the grid loss, a braking torque is applied to the power train during a period of time and said period of time is determined as a function of the torsional resonance frequency of the power train.

Description

Reduce the method for the torsional oscillation in the power train of wind turbine
Technical field
The present invention relates to a kind of method of controlling wind turbine.More precisely, the present invention relates to a kind of method of the control wind turbine in electrical network disappearance (grid loss) situation.
Background technique
Modern wind turbine is commonly used to feed electrical power in the electrical network.The wind turbine of this kind generally includes the rotor with a plurality of blades.The vaned rotor of tool rotates under the impact of wind for blade.The rotation direct drive generator rotor of rotor shaft (" directly driving "), perhaps the use by gear-box drives generator amature.
During normal running, the rotating speed of wind turbine is by acting on the magnetic moment on the generator and acting on epitrochanterian aerodynamics Torque Control.In addition, usually predict and have braking system.
Being used for control action is known in the various approach of the epitrochanterian aerodynamics moment of wind turbine.In " pitch-adjusting " wind turbine, rotor blade can rotate around its longitudinal axis, with the angle of attack of control wind for blade.In the wind turbine that " passive-stall " regulated, when wind speed increases to predetermined wind speed when above, stall automatically occurs on blade.Aerodynamics moment is restricted thus.
Braking system mechanically acts on the lower velocity shaft usually, perhaps acts on the high speed shaft.The electric braking system that acts on the generator also is known.In the wind turbine of pitch-adjusting, blade is used for making wind turbine to slow down with respect to the pitching (pitching) of its feather position.(machinery) break only is used for reaching stopping fully of wind turbine, perhaps turbo machine is remained in its parked-position.
As mentioned previously such, during normal running, the rotating speed of wind turbine is especially by the magnetic Torque Control that acts on the generator.The element of power train (rotor shaft or lower velocity shaft, gear-box, high speed shaft, generator) is acting on epitrochanterian aerodynamics moment and is acting on flexibly distortion under the impact of the magnetic moment on the generator.Potential energy is stored in the mode of this resiliently deformable.When the electrical network disappearance occured, the magnetic moment at the generator place very suddenly lost, and the potential energy of power train changes into kinetic energy.Therefore, power train stands torsional oscillation.These vibrations particularly may be very harmful for gear-box, and may reduce significantly its life-span.
In the prior art, it is known processing the whole bag of tricks electrical network disappearance and that reduce torsional oscillation.WO 2007/082642 described a kind of by reducing rotor blade propeller pitch angle, mechanical brake is applied to the method for processing the electrical network disappearance on the high speed shaft subsequently.WO2004/098968 has described a kind of braking method under the electrical network failure conditions.Braking device acts on the high speed shaft.The hydraulic pressure of control break stops until wind turbine reaches fully.Described device and its controlling method are particularly suitable for being used in " stall-adjusting " wind turbine.WO 03/040556 has described a kind of method that wind turbine is slowed down, and the purpose of the method is to avoid torsional oscillation.In the method, based on the free frequency of wind energy converter, by the retarding moment of predetermined time sequential adjustment break.US 6,254, and 197 have described a kind of selectable Hydraulic braking system a kind of method of controlling it of unifying.The concrete grammar regulation of describing at first applied aerodynamic brakes (the movable end of blade) and apply mechanical brake after 15 seconds period.
Therefore art methods is complicated is expensive also.In addition, they can't produce satisfied result all the time.So, exist to a kind of under the electrical network deletion condition needs of the method for improved control wind turbine, the method can reliably and easily be applied to modern wind turbine.
Summary of the invention
Target of the present invention is to achieve this end.According to the method that the invention provides the torsional oscillation in a kind of power train that in the situation of electrical network disappearance, reduces wind turbine, it is characterized in that, after the electrical network disappearance, during a time period braking moment is applied on the power train, the described time period is determined according to the torsional resonance frequency of power train.
Preferably, the described time period is also according to determining in the instantaneous of electrical network disappearance and the delay that applies generation between braking moment instantaneous.
Preferably, after occuring, the electrical network disappearance basically applies immediately braking moment.
Preferably, with the described time period be specified to be maximum allow the period 50% to 100% between, described maximum half that allows torsional resonances period that the period is confirmed as power train deducts in the instantaneous of electrical network disappearance and the delay that applies generation between braking moment instantaneous.
Preferably, the described time period is specified to be described maximum allow the period 70% to 100% between.
Preferably, the described time period is specified to be described maximum allow the period 80% to 100% between.
Preferably, the described time period is approximate 0.4 second.
Preferably, during the single time period, apply braking moment.
Preferably, consider to determine to be applied to braking moment on the power train at the instantaneous wind speed of electrical network disappearance.
Preferably, consider to determine to be applied to braking moment on the power train in the snap of electrical network disappearance in epitrochanterian aerodynamics moment.
Preferably, consider to determine to be applied to braking moment on the power train in the instantaneous electric power that is produced by generator of electrical network disappearance.
Preferably, also consider to determine to be applied to braking moment on the power train in the instantaneous of electrical network disappearance and the period of the delay that applies generation between braking moment instantaneous and braking.
Preferably, only under occurring in wind speed more than the predetermined minimum windspeed, electrical network disappearance just applies braking moment.
Preferably, in the situation of the speed of not considering the prevailing wind when electrical network lacks, apply braking moment.
Preferably, the pitch control system of wind turbine blade also basically follows electrical network disappearance closely and activates, thereby after releasing brake device, the pitch control of rotor blade is used for further making wind turbine to slow down.
Preferably, braking moment acts on the high speed shaft of power train.
In the situation of electrical network disappearance, braking moment was applied on the power train during a time period, and the described time period is determined according to the torsional resonance frequency of power train.The power train of wind turbine has for each power train and thereby is unique torsional resonance frequency for every type wind turbine.When electrical network lacked, the magnetic moment of generator disappeared, and power train will be to be the frequency starting oscillation of its torsional resonance frequency.Therefore when determining braking time interval, should consider this frequency.Thereby with the approach that the present invention drops into enforcement be: the resonant frequency of determining power train; Determine (calculating) required braking time interval according to this resonant frequency; And after the electrical network disappearance, during the braking time interval of determining, apply break.
Preferably, the described time period is also according to determining in the instantaneous of electrical network disappearance and the delay that applies generation between braking moment instantaneous.For the optimum of the torsional oscillation that obtains reducing, break only should be in the period that follows the electrical network disappearance closely (moment of lower velocity shaft reduces in this period, namely therein power train in period of " unwinding ") activated.Moment in lower velocity shaft applies break when increasing, may cause increasing the consequence of torsional oscillation.Therefore, also preferably consider to determine braking time interval in the instantaneous of electrical network disappearance and the delay that applies generation between braking moment instantaneous.Therefore according to this method for optimizing, the approach that the present invention is dropped into enforcement is: the resonant frequency of determining power train; Determine in the instantaneous of electrical network disappearance and the delay that applies generation between braking moment instantaneous; Then determine the braking time interval that (calculating) is required according to these two parameters; And after the electrical network disappearance, during the braking time interval of determining, apply break.
Preferably, actuated brake immediately after detecting electrical network disappearance basically.
Any braking system can be used in the method according to the invention, and each braking system will have the intrinsic minimal reaction time.Braking system is faster for the reaction of electrical network disappearance, and is longer in the power train time that braking moment can apply during still in unwinding.
Preferably, with the described time period be specified to be maximum allow the period 50% to 100% between, described maximum half that allows torsional resonances period that the period is confirmed as power train deducts the instantaneous of electrical network disappearance and applies delay between braking moment instantaneous.
More preferably, with the described time period be specified to be described maximum allow the period 70% to 100% between, and most preferably between 80% to 100%.
In other words, the described time period just be chosen to ideally less than half of the torsional resonances period of power train deduct the instantaneous of electrical network disappearance with apply the delay that occurs between braking moment instantaneous, that is, maximum braking time interval is definite according to following formula:
t max_brake＝0.5·t resonanc_period_power_train-t delay
As mentioned previously such, optimum for the torsional oscillation that obtains reducing, break only should activated following in the period of electrical network disappearance (moment of lower velocity shaft reduces in this period, namely therein power train in period of " unwinding ") closely.Power train during half period of beginning of the first torsional oscillation period just in unwinding.Ideally, break should activated during this All Time.Yet, do not have braking system lingeringly not react.Therefore, this delay (in the instantaneous of electrical network disappearance and the time that applies between braking moment instantaneous) should be from this period deduction that partly vibrates, with definite maximum braking time interval.Thereby the maximum braking time interval of formula.Ideally, break applies to such an extent that grow as far as possible (to have its maximum efficiency) in this maximum braking time interval.
Preferably, braking time interval is approximate 0.4 second.The braking time interval that has been found that approximate 0.4 second is sufficiently long for reducing significantly torsional oscillation, and is so to lack simultaneously, so that the moment of lower velocity shaft is still reducing.
Preferably, braking moment applies during single short time period.After stopping break, needn't be in order further to reduce torsional oscillation actuated brake again.
Preferably, consider to determine the braking moment that applied by break at the instantaneous wind speed of electrical network disappearance.More preferably, consider that acting on epitrochanterian aerodynamics moment determines braking moment.Selectively, consider to determine braking moment in the instantaneous electric power that is produced by generator of electrical network disappearance.Best result not necessarily realizes by applying maximum available braking moment.But there is the optimum braking force square that in method, will use.
In the operation period of wind turbine, usually measure the speed of prevailing wind.Therefore, the approach of determining the optimum braking force square is the instantaneous wind speed of considering in the electrical network disappearance.
The more accurately approach of determining the optimum braking force square can be considered the instantaneous aerodynamics moment in the electrical network disappearance.Not only depend on wind speed in this instantaneous aerodynamics moment, and for example depend on the propeller pitch angle of blade.More preferably, consider braking period, the instantaneous of electrical network disappearance with apply the delay that occurs between braking moment instantaneous and determine the optimum braking force square in the instantaneous aerodynamics moment that electrical network lacks.This can use following equation expression: M Brake.opt=kM Aero
In this formula, M Brake.optThe optimum braking force square, and M AeroInstantaneous in epitrochanterian aerodynamics moment in electrical network disappearance.K is according to braking time interval and the coefficient determined in the instantaneous of electrical network disappearance and the delay that applies generation between braking moment instantaneous for every kind of wind turbine type.Thereby k has unique value for every kind of wind turbine type.
Complicated is that wind turbine does not comprise directly measuring the system of aerodynamics moment usually.In order to overcome this complexity, measure electric power, then can use following formula to determine aerodynamics moment:
M aero _ HSS = P electr ω HSS
In this formula, M Aero_HSS(aerodynamics) moment in high speed shaft, P ElectrThe instantaneous electric power that is produced by generator in the electrical network disappearance, and ω HSSIt is the rotating speed of high speed shaft.The extraordinary estimation of this formula aerodynamics moment.Therefore, using the instantaneous electric power (no matter it with which kind of mode records) that is produced by generator in the electrical network disappearance in current wind turbine is to determine the good approach of optimum braking force square.
In a word, the snap of considering to lack at electrical network can be determined the optimum braking force square in epitrochanterian aerodynamics moment.Intermediate steps in this method can be to use above formula to estimate aerodynamics moment.Selectively, directly determine the optimum braking force square by the measurement in the instantaneous electric power that is produced by generator of electrical network disappearance.
Optionally, only occur in the instantaneous ability actuated brake of high wind speed in the electrical network disappearance.The reduced complexity of system further causes cost thus.Can not cause unacceptable damage if determine the impact of torsional oscillation under low wind speed, then this optional mode is particularly preferred.
Another optional mode is not consider wind speed and in brake application method when the electrical network disappearance occurs.System will be more complicated, because will need more complicated control algorithm.Yet torsional oscillation all can advantageously reduce under any situation of electrical network disappearance.
Preferably, system for rotating is arranged in the wind turbine, and system for rotating also basically follows electrical network disappearance closely and activate, thereby after releasing brake device, the pitch control of rotor blade is used for further making wind turbine to slow down.Mechanical brake more directly acts on the power train than system for rotating.Thereby mechanical brake is more suitable for reducing immediately torsional oscillation.After the releasing brake device, only need system for rotating that wind turbine is slowed down.In the situation of electrical network disappearance, two kinds of systems all activated.The combination of mechanical brake and pitching blade reduces torsional oscillation significantly, and can guarantee the suitable shutdown of wind turbine.Break equally only is used for reaching finally stopping fully of wind turbine, perhaps turbo machine is remained in its parked-position.
In principle, the break of any kind is all in the method available.Advantageously, also be used in according in the braking method under the electrical network deletion condition of the present invention for the break that wind turbine is taken to the dead halt setting.Independent break needn't be provided.
In principle, any type of arrestment mechanism (hydraulic pressure, electric etc.) all can be used for braking system.Yet system need to be exercisable in the situation of electrical network disappearance.This means that system should can work in situation about not supplying with from the electric power of electrical network.Can predict under the electric braking system situation and have battery.Can predict the accumulator that for the wind turbine that comprises hydraulic brake, has hydraulic fluid.
Description of drawings
Other possibility embodiment of the present invention and their advantage make an explanation with reference to the accompanying drawings.In the accompanying drawings:
Fig. 1 shows the wind turbine with braking system, and the method according to this invention can be applicable to this wind turbine.
Fig. 2 shows in the simulation of the torsional oscillation in the rotor shaft after the electrical network disappearance under the 7m/s wind speed.
Fig. 3 shows two seconds the more detailed view after electrical network disappearance of Fig. 2.
Fig. 4 shows in the simulation of the torsional oscillation in rotor shaft after the electrical network disappearance under the 12m/s wind speed.
Fig. 5 shows two seconds the more detailed view after electrical network disappearance of Fig. 4.
Fig. 6 shows in the simulation of the torsional oscillation in rotor shaft after the electrical network disappearance under the 25m/s wind speed.
Fig. 7 shows the simulation for different braking moments torsional oscillation in the rotor shaft after the electrical network disappearance under the 7m/s wind speed, both uses the method according to this invention.
Fig. 8 shows the simulation for different braking moments torsional oscillation in the rotor shaft after the electrical network disappearance under the 12m/s wind speed, both uses the method according to this invention.
Embodiment
With reference to Fig. 1, show the schematic representation of wind turbine.Rotor 10 comprises a plurality of blades.Blades installation (also claims: lower velocity shaft) on 12 at rotor shaft.Gear-box 11 is transformed into rotatablely moving of high speed shaft 13 with rotatablely moving of rotor shaft.Brake disc 14 is installed on the high speed shaft.Hydraulic brake represents with reference character 15.In this drawing, show the in the method according to the invention possible embodiment of spendable braking system.Yet in principle, any type of break can be applicable in the method according to this invention.
High speed shaft 13 makes the rotor motion of generator 16.The electric power that is produced by generator supplies in the electrical network 18 by the suitable electric elements that represents with reference character 17 generally.The system for rotating of reference character 19 expression blades, this system for rotating can make blade rotate along their longitudinal axis.In the method according to the invention, system for rotating is optional.Yet preferably has a system for rotating.
Fig. 2 shows the result of the simulation of the torsional oscillation in the power train of wind turbine.The electrical network disappearance occurs in the t=5 place.Speed at the instantaneous prevailing wind that the electrical network disappearance occurs is 7m/s.Show for the torsional oscillation of two kinds of different situations in power train.(dotted line among Fig. 2) do not apply braking moment in the first situation, i.e. actuated brake not.Can see that torsional oscillation has high amplitude, and only very lentamente decay of vibration.In the second situation (continuous lines among Fig. 2), braking moment lacks in the situation about postponing in rear 0.05 second at electrical network and applies 0.4 second period.Preferably after the electrical network disappearance, apply as quickly as possible break.In this simulation, use 0.05 second delay, because its estimation is the reaction time of the minimum of braking system.
For the method according to this invention, the period of braking needs not to be 0.4 second.Also can realize useful result (dropping in protection scope of the present invention) by means of different braking time intervals.
In Fig. 2, can see, apply braking moment and continue the amplitude that single short time period reduces torsional oscillation significantly.In addition and for above-mentioned reasons, torsional oscillation is decayed quickly.
Fig. 3 shows the result such as the identical simulation among Fig. 2, but shows initial two seconds more detailed view after the electrical network disappearance occurs.
Figure 4 and 5 show similar simulation, but under the wind speed of 12m/s.And here, the electrical network disappearance occurs in the t=5 place, at the after-applied 0.4 second braking time interval of 0.05 second delay.Obtained similar results.Use the method according to this invention, torsional oscillation is reduced.The result of Figure 4 and 5 is compared with those results of Fig. 2 and 3, clear finds out, the amplitude of torsional oscillation under the wind speed of 12m/s than height under the wind speed at 7m/s.
Fig. 6 shows at the torsional oscillation when the electrical network disappearance occurs under the wind speed of 25m/s.Show again attainable the reducing (continuous lines among Fig. 6) of using according to the torsional oscillation of the inventive method.
The amplitude of the torsional oscillation that generates under different wind speed changes.Under higher wind, torsional oscillation is larger, and thereby also larger for the potential damage of power train element.If cost is most important purpose, then only therefore may be selected to and in the situation of the instantaneous generation of speed of high prevailing wind, just implement this braking method in the electrical network disappearance.If electrical network disappearance occurs under the low wind speed, actuated brake not then, and torsional oscillation can continue the long period.This may think acceptable under certain situation.
Yet, acceptable if this does not think, when any electrical network disappearance occurs, under high and low wind speed, all can implement braking method.
Fig. 7 show for different braking moments under the 7m/s wind speed after electrical network disappearance the analog result of the torsional oscillation in power train, both use the method according to this invention.Can see that from this figure best result not necessarily realizes by applying maximum braking moment.With when applying the braking moment of 4000Nm, compare, if apply the braking moment of 3000Nm, then reduce torsional oscillation.
Fig. 8 shows the analog result for different braking moments torsional oscillation in the power train after the electrical network disappearance under the 12m/s wind speed, both uses the method according to this invention.
Fig. 7 and 8 shows when using the method according to this invention, has certain optimum braking force square.The increase braking moment surmounts this optimum value and can increase torsional oscillation with respect to best circumstance.In the method according to the invention preferably, the consideration wind speed is determined braking moment.More preferably, the snap of considering the electrical network disappearance is determined the optimum braking force square in epitrochanterian aerodynamics moment.

Claims (16)

1. the method for the torsional oscillation in the power train that in the situation of electrical network disappearance, reduces wind turbine, it is characterized in that, after the electrical network disappearance, during a time period, braking moment is applied on the power train, the described time period is determined according to the torsional resonance frequency of power train.
2. the method that reduces torsional oscillation according to claim 1 is characterized in that, the described time period is also according to determining in the instantaneous of electrical network disappearance and the delay that applies generation between braking moment instantaneous.
3. the method that reduces torsional oscillation according to claim 1 is characterized in that, basically applies immediately braking moment after the electrical network disappearance occurs.
4. the method that reduces torsional oscillation according to claim 2, it is characterized in that, with the described time period be specified to be maximum allow the period 50% to 100% between, described maximum half that allows torsional resonances period that the period is confirmed as power train deducts in the instantaneous of electrical network disappearance and the delay that applies generation between braking moment instantaneous.
5. the method that reduces torsional oscillation according to claim 4 is characterized in that, with the described time period be specified to be described maximum allow the period 70% to 100% between.
6. the method that reduces torsional oscillation according to claim 5 is characterized in that, with the described time period be specified to be described maximum allow the period 80% to 100% between.
7. the method that reduces torsional oscillation according to claim 1 is characterized in that, the described time period is approximate 0.4 second.
8. the method that reduces torsional oscillation according to claim 1 is characterized in that, applies braking moment during the single time period.
9. the method that reduces torsional oscillation according to claim 1 is characterized in that, the instantaneous wind speed that consideration lacks at electrical network determines to be applied to the braking moment on the power train.
10. the method that reduces torsional oscillation according to claim 9 is characterized in that, considers to determine to be applied to braking moment on the power train in the snap of electrical network disappearance in epitrochanterian aerodynamics moment.
11. the method that reduces torsional oscillation according to claim 1 is characterized in that, the instantaneous electric power that is produced by generator that consideration lacks at electrical network determines to be applied to the braking moment on the power train.
12. the method that reduces torsional oscillation according to claim 8 is characterized in that, also considers to determine to be applied to braking moment on the power train in the instantaneous of electrical network disappearance and the period of the delay that applies generation between braking moment instantaneous and braking.
13. the method that reduces torsional oscillation according to claim 1 is characterized in that, only lacks under the wind speed that occurs in more than the predetermined minimum windspeed at electrical network and just applies braking moment.
14. the method that reduces torsional oscillation according to claim 1 is characterized in that, applies braking moment in the situation of the speed of not considering the prevailing wind when electrical network lacks.
15. the method that reduces torsional oscillation according to claim 1, it is characterized in that, the pitch control system of wind turbine blade also basically follows electrical network disappearance closely and activates, thereby after releasing brake device, the pitch control of rotor blade is used for further making wind turbine to slow down.
16. the method that reduces torsional oscillation according to claim 1 is characterized in that braking moment acts on the high speed shaft of power train.
CN2009801172746A 2008-05-14 2009-05-12 Method of reducing torsional oscillations in the power train of a wind turbine Expired - Fee Related CN102027233B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP08156209.2 2008-05-14
EP08156209A EP2119910B1 (en) 2008-05-14 2008-05-14 Method of reducing torsional oscillations in the power train of a wind turbine
PCT/EP2009/055736 WO2009138409A1 (en) 2008-05-14 2009-05-12 Method of reducing torsional oscillations in the power train of a wind turbine

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CN102027233B true CN102027233B (en) 2013-04-24

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AU (1) AU2009248118B2 (en)
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CA2722386A1 (en) 2009-11-19
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CN102027233A (en) 2011-04-20
US8476779B2 (en) 2013-07-02
WO2009138409A1 (en) 2009-11-19
JP2011521142A (en) 2011-07-21
AU2009248118A1 (en) 2009-11-19
ATE552421T1 (en) 2012-04-15
DK2119910T3 (en) 2012-07-16
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US20110049890A1 (en) 2011-03-03
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